EP 1754364 A1 20070221 - CONFERENCE SYSTEM
Title (en)
CONFERENCE SYSTEM
Title (de)
KONFERENZSYSTEM
Title (fr)
SYSTEME DE CONFERENCE
Publication
Application
Priority
- IB 2005051647 W 20050520
- EP 04102274 A 20040525
- EP 05738579 A 20050520
Abstract (en)
[origin: WO2005117409A1] A conference system (1) comprises a central unit (2) and speaker units (3) which are connectable to the central unit. The central unit (2), which serves to combine speech signals from the speaker units (3) and to distribute the combined speech signals to said units, comprises an adaptive filter (23) for suppressing feedback. Each speaker unit (3) comprises a microphone (33), a loudspeaker (34), an activation switch (35) and an adaptive filter (36) coupled between the microphone (33) and the loudspeaker (34). When the speaker unit is not activated, the adaptive filter (36) serves as an echo canceller, while serving as a feedback suppressor when the speaker unit is activated. By keeping the loudspeaker (34) always on, any transients due to mis-adaptations of the filter (36) are avoided.
IPC 8 full level
H04M 9/08 (2006.01); G10L 21/0208 (2013.01); H04M 3/56 (2006.01)
CPC (source: EP US)
H04M 9/08 (2013.01 - EP US); H04M 3/56 (2013.01 - EP US); H04M 3/568 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU MC NL PL PT RO SE SI SK TR
DOCDB simple family (publication)
WO 2005117409 A1 20051208; CN 1957592 A 20070502; EP 1754364 A1 20070221; JP 2008500759 A 20080110; US 2008267378 A1 20081030
DOCDB simple family (application)
IB 2005051647 W 20050520; CN 200580016830 A 20050520; EP 05738579 A 20050520; JP 2007514252 A 20050520; US 56917005 A 20050520